90420309 has 12 divisors (see below), whose sum is σ = 149265376. Its totient is φ = 51668712.

The previous prime is 90420277. The next prime is 90420311. The reversal of 90420309 is 90302409.

It is not a de Polignac number, because 90420309 - 2⁵ = 90420277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90420329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 717559 + ... + 717684.

Almost surely, 2^90420309 is an apocalyptic number.

It is an amenable number.

90420309 is a deficient number, since it is larger than the sum of its proper divisors (58845067).

90420309 is a wasteful number, since it uses less digits than its factorization.

90420309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435256 (or 1435253 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 90420309 is about 9508.9594067911. The cubic root of 90420309 is about 448.8370117560.

The spelling of 90420309 in words is "ninety million, four hundred twenty thousand, three hundred nine".